Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December's arrival comes with a mild decrease in the average high-temperature, moving subtly from a fresh 51.1°F (10.6°C) in November to a frosty 43.5°F (6.4°C). Registering an almost steady temperature, Dennis's nights in December see an average low of 36.7°F (2.6°C).Humidity
The average relative humidity in December in Dennis is 75%.Rainfall
In Dennis, during December, the rain falls for 11 days and regularly aggregates up to 1.38" (35mm) of precipitation. Throughout the year, there are 129.6 rainfall days, and 13.94" (354mm) of precipitation is accumulated.Snowfall
Months with snowfall in Dennis, Massachusetts, are January through April and December. December is the first month it typically snows in Dennis, Massachusetts. Throughout December, in the average 4.2 snowfall days, it receives 0.43" (11mm) of snow. Throughout the year, there are 21.6 snowfall days, and 2.17" (55mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 6:49 am and sunset at 4:11 pm. On the last day of December, in Dennis, sunrise is at 7:07 am and sunset at 4:20 pm EST.
Sunshine
December has the least sunshine of the year, with an average of 4.6h of sunshine.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the average person.Note: A daily high UV index of 2 in December leads to these guidelines:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Frequently asked questions
How cold is December in Dennis?
What is the average humidity in December in Dennis?
How much does it rain in Dennis in December?
When does it start snowing in Dennis?
What is the month with the shortest days in Dennis?
How many hours of daylight does Dennis have in December?
When are sunrise and sunset in December in Dennis?
What is the month with the least sunshine in Dennis?
How many hours of sunshine does Dennis have in December?
What is the month with the lowest UV index in Dennis?
What is the UV index reading in December in Dennis?
Average temperature in December
Dennis, MA
- Average high temperature in December: 43.5°F
The warmest month (with the highest average high temperature) is August (72.5°F).
The month with the lowest average high temperature is January (38.3°F).
- Average low temperature in December: 36.7°F
The month with the highest average low temperature is August (68.2°F).
The coldest month (with the lowest average low temperature) is January (30.4°F).
Average pressure in December
Dennis, MA
- Average pressure in December: 30.03"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Dennis, MA
- Average wind speed in December: 15.8mph
The windiest month (with the highest average wind speed) is January (16.4mph).
The calmest month (with the lowest average wind speed) is August (10.4mph).
Average humidity in December
Dennis, MA
- Average humidity in December: 75%
The months with the highest relative humidity are May, June and July (83%).
The month with the lowest relative humidity is November (74%).
Average rainfall in December
Dennis, MA
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is October (1.89").
The driest month (with the least rainfall) is August (0.94").
Average rainfall days in December
Dennis, MA
- Average rainfall days in December: 11 days
The month with the highest number of rainy days is May (13.2 days).
The month with the least rainy days is February (8.1 days).
Average snowfall in December
Dennis, MA
- Average snowfall in December: 0.43"
The months with the highest snowfall are January and February (0.63").
The months with the least snowfall are May, June, July, August, September, October and November (0").
Average snowfall days in December
Dennis, MA
- Average snowfall days in December: 4.2 days
The month with the highest number of snowfall days is January (6.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Dennis, MA
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days in December
Dennis, MA
- Average sunshine days in December: 15.7 days
The month with the most sunshine days is September (18.5 days).
The month with the least sunshine days is February (14.8 days).
Average UV index in December
Dennis, MA
- Average UV index in December: 2
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Dennis, MA
- Average cloud cover in December: 50
The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in December
Dennis, MA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Dennis, Massachusetts, USA
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